modded 3.41 help

Sorry guys if this q has been addressed already but i cant find answers anywhere. Ive modded most systems i own, I own a lot of retro systems i love it. Brings me to my drama. I got a 120gb cech-2102a ages ago n it was on 3.5 thankfully so i got a ps3break n i did the origional dg 3.41(3.56) spoof to the death of me. Tried awhile ago to do the 3.55 ofw update xmb, data corrupted. Tried recovery, asks for 3.56 or higher, thanks to the stupid spoof, then i did service mode 3.55 and all was going well untill i got stuck in an update loop. After tearing much hair out n swearing somehow recovered it back to 3.41(3.56) again. A yr or so passed with new development thought i would have a crack. Got e3 flasher limited but looked into 3.56 rebug spoofer to remove 3.56 so i can "soft" update to desired fw. Cant find it anywhere n dont even know if it will remove it from the modded fw, doubt it. Tried the 4.21 update as to flash\dg from there, it installs, reboots then data corrupted same as the 3.55. I know the 3.55 is good pup as i used it in the origional jb method to up\downgrade. Not interested in psn\sen just want to put the 40 odd 3.55 n below friendly disc games i have on hdd rather than keep using my discs. Seems with my new membership i cant reply threads so many many thanks for ppl that know more than me n can help or have been through this painfull dilemma before

How to fix your problem
1) update your cosole to the latest ofw which is 4.31 using recovery mode
2) use e3 flasher to downgrade you console back to 3.55
3) install rebug/rogero 4.30

last known dg according to e3-tech is 4.21. I will have a look

Thanks anyway. I finally found 3.21 n went that way